During the database load, the load utility writes logical parent records that appear in HDAM, HIDAM, and secondary index databases out to the logical workfile. However, the load utility does not write out logical parent records for HISAM databases. Because logical parents from HISAM databases do not appear in the logical workfile, you can reduce its space requirements accordingly. If you use the DASD space requirement formula shown above, you should adjust it so that it does not include any HISAM logical parents.
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